Which U.S. policy aimed at containing communism during the Cold War?

The Truman Doctrine is the U.S. policy that specifically aimed at containing communism during the Cold War. Announced in 1947, it arose in response to the geopolitical tensions between the United States and the Soviet Union, as well as the threat of communism spreading in various regions, particularly in Greece and Turkey. The doctrine asserted that the U.S. would provide political, military, and economic assistance to countries resisting communist influence. This was a pivotal moment in the Cold War, marking a commitment by the U.S. to actively oppose the spread of communism around the world.

The other options represent different historical contexts or objectives. The Monroe Doctrine, established in 1823, was primarily concerned with European colonization and interference in the Americas. The Marshall Plan, initiated in 1948, focused on economic recovery for Western Europe after World War II, indirectly aimed at preventing the spread of communism by stabilizing those economies. The Eisenhower Doctrine, announced in 1957, expanded the idea of containment specifically to the Middle East, but it came later in the Cold War and was more focused on countering Soviet influence in that region.